histone H3R26 arginine deiminase activity https://github.com/geneontology/go-ontology/issues/23152 https://github.com/geneontology/go-ontology/issues/28520 https://github.com/geneontology/go-ontology/issues/30578 Catalysis of the reaction: H2O + histone H3 L-arginyl (position 26)= histone H3 L-citrullyl (position 26) + NH4+, resulting in histone H3 citrullination at position 26. H3-R26 citrullination histone-arginine deiminase activity (H3-R26 specific) 2022-04-06T13:12:51Z molecular_function GO:0140798 pg histone H3-R26 arginine deiminase activity Comment: Note that the residue position corresponds to the canonical human H3 histone (UniProtKB:P84243); this residue is conserved across all eukaryotes. Residue 1 is the first residue following removal of the initiating Methionine (Met). Note that each histone is encoded by multiple genes, and sequences may vary across different genes within an organism. The substrate for histone deiminase may be methyl-arginine, rather than arginine (see PMID:35197210 and PMID:16567635). histone H3 arginine deiminase activity